Stevedore jack



Feb.` 13, 1945 B. N. WILUAMS ET AL l 2,369,33

STEVEDORE JACK Filed May 11, 1944 y 8 rivm/.svg

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removed therefrom.

Patented Feb. 13, 1945 UNITED-[STATE PATENT OFFICE enjamin Ni Williamsfeacon, and Thomas. Sanford, NewYork',

ApplicatioiiMay 11,1o44,`sriarNq. 535,053`

`This invention4 relates 'to i new provementsinastevedore jack. i,

More spvciflcally, the invention proposes` the` `construction ofl a` stevedorel jack arranged in a manner to provide a base having an upwardly extending super-structure upon which a crow-` bar is adapted to be pivotally mounted tobe `ful- `crumed about the t superstructure to facilitate the r speedy loading and unloading of ships and lift-` ingA heavy objects around docks warehousesend' other similar` places.

solaires. (.01. 25g-13o) i The boxe-11k@ base fo nasanopen topV closed by means of a plate I2 formingy `aportion of the su` perstructure` II and `which is` securely held in` position by screws I3 which pass `threadedly through thej plate I2. andengage complementary..

lugs I4; The lugs I4 are formed onthe inside faces` of thewalls of the box-like base I0. The

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A further object of the invention proposes pro! 1 mding` the. superstructure with several pairs of l fulcrum sockets at different elevations whichjare adapted to be selectively engaged by trunnions formed on thecrowbar for permitting the angur lar and elevated positionof the crowhar` relative to the superstructure to be adjusted to meet the lifting requirements of each individualjob.

A furtheru'object of the invention propo-ses` provi'ding the stevedore jack with abort-like base encasing a "pressure plate provided with spurs adapted to `be projected `from the base in .a man` `ner to grip the `floor or other surface upon' which the jack is Vrested `to prevent ing the lifting operation.` l r v Still another object' of the invention proposes itl from slippingdurproviding the base` with a cam shaft and cam `provided; for lifting andv lowering the pressure plate relative tothe base in a manner to engage Fig. 1 is a side elevational view of la stevedore jack constructed in accordance with this inven-` Fig. 2 isa plan view of Fig. 1 with the `crowbar VFig. 3 is an enlarged vertical sectional" `view taken on theline 3---3of1igg` `1. Fig. 4 is a vpartial vertical sectional view/"taken on theline 4-4 ofFig. 3. N

Fig. 5 is a partial vertical `sectionalview.taken Ontheline 5;-5of1iig2,` i

Fig. Gis a perspective view of` the bottonipor-` tion of the crowbar, per se.

`The `stevedorejack. accordingto thisfinven-` tion,` comprisesa boxflike base IUhaving a su-` perstructure II mounted upon the top thereof.`

`superstructure I I further includes a pair of `laterally spaced verticalwalls 'I`5;`which extend upwards from the plate I2; The vertical walls I5 are reinforced by buttresses, I6 which are integrally formed between the outer faces of the walls I5' 'and the top faceof the'pl'ate I2. The top i portionsfof thevertical walls `I5 are provided with several pairs of ful'crum sockets I'I arranged atdifferent elevationsg The `buttresses "I6 have short lengths of4 metal I8 `extended therethrough to provide handles by which theibase portionof r the stevedore jalsmay be lifted.` v t t i `A, crowbar I9 is provided for use in "connecf tion withthe fulcrum `sockets y'I'I of` the `super:` -structure I I.l This crowbarI'Slcomprises a bar portion havingv a flattened nose 2I which is adapted to be `engaged beneath 'the article to` be lifted bythe stevedore jack and also asa pry7 'between twoobjects. The `back end offthe `barrportion 2l)` has a threadedgshank2I` upon which a lever befr 22- is adapted to be threadediy engaged; The top ofthe barxportion is`formed with a pro- '30 jected threadedfstud 23`u`pon which a foot pressure bar 24 is threadedlyerlgaged. On theside ofthe superstructure II permittingthe trunnion r 4()` of `the bar portion 20, opposed to the portion providedwith the threaded\st`ud"2`3,I a depending lug i 25 isfformed from which trunnions 26 extend in opposite directicns.f In engaging the crowbaryl uponthe superstructure II` the bottom portion l of` the` lug 25 is projected into the `space between the adjacentfaces of the vertical walls I5 elements 26 cutouts I'l.

``The elevatedportionfof` the crowloar` I5 may r to .bejengagedwith the fulcrum be adjusted byengaging the trunnion` elements`26` Structure II' that a" position may be determined with a desired pair of thelfulcrumsockets "ITI,` It will be. found; `thatgby iad'justingfthe position of the trunnion elements ZBrelative to theusupergivin-g` the best mechanical advantage for lifting stevedore jack isrestedi. i v 'A pressure plate `ZIj is verticallyslidably mounta given `article from the surfaceupon which the ed withinthe basefl'. This pressure platey is provided with a pluralityl of,v downwardly pro` jecting` spurs 28` which 'are `adapted to be projected` through` complementary. openings 29` formed in the base wall of the box-like base Il! to engage a surface upon which the stevedore jack is resting to prevent the jack from slipping. The top ends of the spurs 28 are threadedly engaged with the pressure plate 21 and the 4bottom ends 'thereof are pointed and directed in a manner to rigidly engage the surface upon which the jack is resting.

Means is provided for lifting and lowering the pressure plate 21 relative to thebase wall of the box-like base I to extend and retract the spurs 28 relative to the openings 29. This means comprises a cam shaft 30 which is rotatively extended laterally through the box-like base I0 and which is provided at its center with a cam 3l.

This cam 3l is extended through complef mentary cam shaped openings 32 formed in ver# tical walls 33 which extendfrom the top face4 or the pressure plate 21. Rotations of the cam shaft 30 will be transmitted to the cam 3l and due to its extension through the cam shaped openings 32 it will 'cause the pressure plate 21 to be lifted and lowered. p

One end of the cam `shaft 30 is extended from the box-like base I0 and has a pivoting lever 34 xedly attached thereto. `This pivoting lever 34 is provided at its free end with a foot pedal 35 which is adapted to be stepped upon for applying pressure theretoto cause the cam shaft. 3l]` to return and extend the'spurs 28 from` the position and the spurswill be projected from the base thereof.

The manner of using the stevedore jack, according to this invention, is as follows:

The box-like baselll together with its superstructure Il is rested `upon the surface of a floor adjacent an objectto be lifted and the lever 34 is pivoted to movethe pressure plate 21 downe wards'within the box-like base I0. This will extend the spursl 28v from `the bottom of the boxlike base l0 and dig them into the surface to retain the base against moving'relative to the oor surface. The crowbar I9 then has its trunnion elements 26 engaged with a given pair of` fulcrum sockets I1 at the desired elevation and the flattened nose 2l thereof is engaged beneath the article to be lifted. The crowbar I9 is then pivoted about the trunnion elements 26 through the medium of the bars 22 and 24 to cause the article to be lifted to the desired elevation to permit a dolly or other similar caster element to be, engaged beneathvthe object sothat it may be moved about.

While` wehaver illustrated and described the preferred embodiments of our invention, it is to be understood that we do not limit ourselves to the precise constructions herein disclosed and the right is reserved to all changes and modifica- Y tions coming within the scope of the invention as dened in the appended claims.

` Having thus described our invention, what we claim as new, and desire tov securev by United States Letters Patent is:

i 1. A stevedore' jack, comprising abox-like base, a superstructure mounted on said base and having a pair of laterally spaced vertical walls with several pairs of -fulcrumy sockets at different elevations, a crowbar-provided with a trunnion for engaging a pair of said fulcrum sockets, a pressure plate Within said base and provided with spurs for projecting from apertures in the bottom wall of said base, and a cam shaft with a cam for raising and lowering said pressure plate. y f

2. A stevedore jack, comprising dbox-like base, a superstructure mounted on said base and having a pair of laterally spaced vertical walls with several pairs of fulcrum sockets at different elevations, a crowbar lprovided with a truny nion for engaging apair of said fulcrum sockets, a pressure plate Within said base and provided with spurs forprojecting from apertures in the bottom'wall of said base, and a cam shaft with a cam for raising and lowering said pressure plate, said superstructure beingcharacterized by a bottom plate closing the top of the box-like'base and said vertical walls being extended from said plate. c l

3'. A stevedore jack, vcomprising a `box-'like base, a superstructure mountedon said base and having a pair of laterally spaced vertical walls with several pairs of fulcrum sockets at different elevations, a crowbar provided with a trunnion for engaging a pair of said fulcrum sockets,

a'pressure plate within said basek and provided.

with spurs for projecting from apertures in the bottom wall of said base, and a cam shaftwith a camfor raising and lowering said pressure plate, said superstructure being 4characterized by a bottom plate closing the` top of the boxj-like base and said vertical walls being extended from said plate, and buttresses provided between the outer faces of said walls and the top face of said plate. v

4. A stevedore jack,v comprising a box-like base, a superstructure mounted on said base and having a pair of laterally spaced vertical walls with several pairs of'fulcrum sockets at dierent elevations, a crowbar providedl with a trunnion for engaging a pair of said fulcrum sockets, a pressure plate within said base and provided with spurs for projecting from apertures in the bottom wall of said base, and a cam shaft with` a cam for raising and lowering said i pressure plate, said superstructure being charhaving a pair of. laterally spaced -vertical walls with severalpairs of fulcrum sockets at different elevations, a crowbar provided with a trunion for engaging a pair of said fulcrum sockets, a pressure plate within said base and provided' with spursy for projecting from apertures inthe bottom wall of said base, and .2f camshaft with a cam for raisingand loweringsaidy pressure plate, said crowbar being characterized by a bar portion having a attened nose, a lever bar mounted on the back end of saidbar portion, a foot pressure loar` mounted onl the front ofsaid bar portion, a depending lug formed onlthe back of said bar portion, and said trunnion element being formed on said depending. lug.

l 6'. A stevedore jack, `comprising alfbinilillde,`

base, a superstructure mounted on said base and having a pair of laterally spaced vertical v `wal1s with several pairs of fulcrum sockets at "diifercnt elevations, a crowbar provided with a trunnion for engaging a pair of said fu1crum` sockets, a pressure plate Within sa'id base and provided with spurs for projecting from apertures in the bottom Wall of said basaand a cam` shaft with a camfor raising and lowering said pressure plate, said spurs having their bottom ends pointed to dig into a surface when projectedv from said box-like base.

7. A stevedore jack, comprising a box-like base, a superstructure mounted on said base and' having a pair of 'laterally spaced vertical" Walls with several pairs of fulcrum sockets at extended laterally through said box-like base, a cam formed on said cam shaft within said` box-like base and engaging cam openings formed in Walls extending from said pressure plate, and means mounted on said cam shaft externally of said box-like base for turning the shaft'to lift and lower the pressure plate. BENJAMIN N. WILLLIAMS. THOMAS D. SANFORD. 

